what is liquid nitrogen used for

Liquid nitrogen is a form of the element nitrogen that's cold enough to exist in a liquid state and is used for many cooling and cryogenic applications,mainly based on its cold temperature and low reactivity. Examples of common applications include:

The freezing and transporting of food products

The cryopreservation of biological samples, such as sperm, eggs, and animal genetic samples

Use as a coolant for superconductors, vacuum pumps, and other materials and equipment

Use in cryotherapy to remove skin abnormalities

The shielding of materials from oxygen exposure

The quick freezing of water or pipes to allow work on them when valves are unavailable

A source of extremely dry nitrogen gas

The branding of cattle

The molecular gastronomy preparation of unusual foods and beverages

The cooling of materials for easier machining or fracturing

Science projects, including making liquid nitrogen ice cream, creating nitrogen fog, and flash-freezing flowers and subsequently watching them shatter when tapped onto a hard surface.

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